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21. Re: [Amps] General question on filament life (score: 1): Author: "David Lisney" <g0fvt@hotmail.com>; Date: Mon, 12 Feb 2007 18:44:38 -0000; Hi, I hope this does not go too far off subject, many years ago I worked in the labs for a large lamp manufacturer and observed in that time some fairly wierd failure mechanisms. One of them that I r; /archives//html/Amps/2007-02/msg00224.html (22,117 bytes)
22. Re: [Amps] 3-500 Pins? (AA6DX - Mark) (score: 1): Author: "David Lisney" <g0fvt@hotmail.com>; Date: Mon, 16 Apr 2007 02:30:02 +0100; Hi, lead will be continued to be allowed to be used in solder for some applications, so the premise that it will be instantly forbidden is untrue... Somewhere on the net >> http://www.rohs.gov.uk/ <<; /archives//html/Amps/2007-04/msg00153.html (8,851 bytes)
23. Re: [Amps] rfi (Kim Elmore (score: 1): Author: "David Lisney" <g0fvt@hotmail.com>; Date: Wed, 2 May 2007 20:44:54 +0100; Hi, this reminds me of something that happened many years ago. I had repaired an amplifier for a friend and was on-air when he first powered it up. As he hit the "operate" switch I could hear his mot; /archives//html/Amps/2007-05/msg00028.html (24,237 bytes)
24. Re: [Amps] QRO-stuff (score: 1): Author: "David Lisney" <g0fvt@hotmail.com>; Date: Thu, 24 May 2007 22:48:52 +0100; Hi, for what it is worth I have bought stuff from this Ebay vendor, ( a pair of GS35Bs), if I remember correctly the Paypal payment was actually made to a ham in the US. To the vendors credit the tub; /archives//html/Amps/2007-05/msg00200.html (9,292 bytes)
25. Re: [Amps] Resistor Types (Manfred Mornhinweg) (score: 1): Author: "David Lisney" <g0fvt@hotmail.com>; Date: Sat, 23 Jun 2007 18:17:24 +0100; In my limited experience of repairing the likes of FT101s I have found evidence that the equalising resistors across the HV diodes fail and take the rectifiers out with them. These resistors perform; /archives//html/Amps/2007-06/msg00124.html (7,769 bytes)
26. Re: [Amps] Amplifier Distortion / Tuning / Etc. (EP Swynar) (score: 1): Author: "David Lisney" <g0fvt@hotmail.com>; Date: Thu, 27 Sep 2007 19:57:33 +0100; Hi, I am happy to accept that the 4CX250B family have their limitations, I run a conduction cooled version (CCS1) on 2m. Sometime I will post my screen regulator circuit somewhere for a reference. It; /archives//html/Amps/2007-09/msg00421.html (8,079 bytes)
27. Re: [Amps] QRO-parts - sound kinda fishy now (steve d) (score: 1): Author: "David Lisney" <g0fvt@hotmail.com>; Date: Tue, 5 Feb 2008 00:04:01 -0000; Hi, FWIW I ordered a pair of GS-35Bs from QRO parts via Ebay a while back, they took a little while to get to the UK but they arrived in good condition and well packed. Amazingly despite the weight o; /archives//html/Amps/2008-02/msg00023.html (6,892 bytes)
28. Re: [Amps] CB GEM (score: 1): Author: "David Lisney" <g0fvt@hotmail.com>; Date: Tue, 25 Mar 2008 20:58:33 -0500; A friend saw probably an equal horror at a ham rally here a while ago, I think what is worrying with QRO amplifiers is that some Homebrew ones are deathtraps but attract purchasers who are not compet; /archives//html/Amps/2008-03/msg00268.html (9,765 bytes)
29. [Amps] DK1OF (score: 1): Author: "David Lisney" <g0fvt@hotmail.com>; Date: Wed, 13 Aug 2008 05:47:44 +0100; Hi, I wonder if anyone has an electronic copy of the DK1OF 2m 4CX250 amplifier project in English? I have the article in PDF format but in German which I believe was published in 1977. Regards David; /archives//html/Amps/2008-08/msg00083.html (6,335 bytes)
30. Re: [Amps] Solid state amplifier cooling (score: 1): Author: David Lisney <g0fvt@hotmail.com>; Date: Thu, 6 Jun 2013 15:35:04 +0100; I used to be in the PC overclocking scene many years ago, I used peltier heatpumps and a homebrew water cooling system to keep the CPUs cool, and it did let them operate at extremely high clock speed; /archives//html/Amps/2013-06/msg00105.html (8,171 bytes)
31. Re: [Amps] Solid state amplifier cooling (score: 1): Author: David Lisney <g0fvt@hotmail.com>; Date: Thu, 6 Jun 2013 18:34:28 +0100; Hi Bill, you raise some significant points, in the overclocked pc arena a few people got obsessed with making optically perfect contact patches between the copper cooling "jackets" and the relevant p; /archives//html/Amps/2013-06/msg00124.html (16,882 bytes)
32. Re: [Amps] Amps Digest, Vol 130, Issue 10 (score: 1): Author: David Lisney <g0fvt@hotmail.com>; Date: Sat, 5 Oct 2013 22:40:51 +0100; Hi, regarding the travelling wave tube amp, you mention 9Kv at only 5ma, it occurs to me that in that instance you could generate your ht from a tiny inverter, possibly followed by a tripler if neces; /archives//html/Amps/2013-10/msg00057.html (15,025 bytes)
33. Re: [Amps] Arctic Silver (score: 1): Author: David Lisney <g0fvt@hotmail.com>; Date: Thu, 12 Dec 2013 05:12:12 +0000; Hi, I have used Arctic Silver in the normal computer CPU application (a twin cpu computer with homebrew watercoolers etc) it did produce a lower thermal resistance junction than the conventional whit; /archives//html/Amps/2013-12/msg00090.html (32,316 bytes)
34. Re: [Amps] Amps Digest, Vol 138, Issue 23 (score: 1): Author: David Lisney <g0fvt@hotmail.com>; Date: Wed, 25 Jun 2014 21:41:36 +0100; Hi, the power supply for the Quadra is a switch-mode, the manual seems to reckon 240v is ok. In the UK our mains voltage is 240v, as far as I know Quadras survive that fine... I personally would run; /archives//html/Amps/2014-06/msg00088.html (28,396 bytes)
35. Re: [Amps] Amps Digest, liquid cooling. (score: 1): Author: David Lisney <g0fvt@hotmail.com>; Date: Wed, 1 Apr 2015 20:54:05 +0100; Hi, I think I would also go for the greatest practical flow, though I think there can be issues with turbulence creating dead spots in the heat exchangers.... Regards David G0FVT Sent from my iPad __; /archives//html/Amps/2015-04/msg00028.html (53,997 bytes)
36. Re: [Amps] Oil v water cooling (score: 1): Author: David Lisney <g0fvt@hotmail.com>; Date: Thu, 16 Apr 2015 17:13:33 +0100; Hi, I believe that not all "distilled water" is suitable for this, you may need to specify "deionised water". The water conductivity needs regular checking, it will rise as it gets contaminated by tr; /archives//html/Amps/2015-04/msg00113.html (12,794 bytes)
37. [Amps] Oil v Water cooling (score: 1): Author: David Lisney <g0fvt@hotmail.com>; Date: Sat, 18 Apr 2015 18:29:00 +0100; Hi, just to clarify, I did not write what was attributed to me here.... my post is further down! _______________________________________________ Amps mailing list Amps@contesting.com http://lists.con; /archives//html/Amps/2015-04/msg00125.html (23,453 bytes)
38. [Amps] Henry amplifier transformer id (score: 1): Author: David Lisney <g0fvt@hotmail.com>; Date: Thu, 2 Jul 2015 20:48:47 +0100; Hi, the Radiodan website lists it as 3200v 800mA, judging by the other transformers listed this is the HT rating when rectified etc, not the RMS voltage. Regards David G0FVT Sent from my iPad _______; /archives//html/Amps/2015-07/msg00003.html (12,999 bytes)
39. Re: [Amps] Regulated filament current (score: 1): Author: David Lisney <g0fvt@hotmail.com>; Date: Sun, 6 Sep 2015 17:44:03 +0100; Hi, I once worked for a lamp manufacturer in R&D, as you can probably imagine some lamps were specified by current but most by voltage. For our own life testing even the "current specified" lamps wer; /archives//html/Amps/2015-09/msg00021.html (10,247 bytes)
40. Re: [Amps] Stripping Litz Wire (score: 1): Author: David Lisney <g0fvt@hotmail.com>; Date: Tue, 23 May 2017 16:25:37 +0000; My late father used a methylated spirits lamp for this, first putting the end of the wire into the flame and then quenching it in the spirits. Perhaps the materials have changes since? 73 de G0FVT __; /archives//html/Amps/2017-05/msg00262.html (6,602 bytes)

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